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<h1>Melisma modules</h1>
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<li><a href="../index.html">Index</a></li>
</ul>
<h2>Contents</h2>
<ul>
<li><a href="#Functions">Functions</a></li>
<li><a href="#Class_script">Class script </a></li>
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<h2>Modules</h2>
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<li><a href="../modules/biquad.html">biquad</a></li>
<li><strong>expression</strong></li>
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<h1>Module <code>expression</code></h1>
<p>Build filters with arithmetic expressions.</p>
<p>
<pre>
<span class="keyword">local</span> mexpression = <span class="global">require</span> <span class="string">'melisma.expression'</span>
<span class="keyword">local</span> input = mepxression.input
<span class="keyword">local</span> lhs = ...
<span class="keyword">local</span> rhs = ...
<span class="keyword">local</span> script = <span class="function-name">input</span>(lhs,<span class="number">0</span>) + <span class="number">0.5</span> * <span class="function-name">input</span>(rhs,<span class="number">10</span>)
<span class="keyword">local</span> expression = script:<span class="function-name">build</span>()
</pre>
</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#input">input(sig, off)</a></td>
<td class="summary">Introduce an input signal in the expression.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#output">output(off)</a></td>
<td class="summary">Introduce the output signal in the expression.</td>
</tr>
</table>
<h2><a href="#Class_script">Class script </a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#script:build">script:build()</a></td>
<td class="summary">Compile an expression script.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
Methods
<dl class="function">
<dt>
<a name = "input"></a>
<strong>input(sig, off)</strong>
</dt>
<dd>
Introduce an input signal in the expression.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">sig</span>
<span class="types"><span class="type">channel</span></span>
Input signal.
</li>
<li><span class="parameter">off</span>
<span class="types"><span class="type">integer</span></span>
Offset in no. of samples.
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="../modules/expression.html#script">script</a></span>
</ol>
</dd>
<dt>
<a name = "output"></a>
<strong>output(off)</strong>
</dt>
<dd>
Introduce the output signal in the expression.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">off</span>
<span class="types"><span class="type">integer</span></span>
Offset in no. of samples.
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="../modules/expression.html#script">script</a></span>
</ol>
</dd>
</dl>
<h2 class="section-header has-description"><a name="Class_script"></a>Class script </h2>
<div class="section-description">
Represents an expression before compilation.
Implements <code>__add</code>, <code>__sub</code>, <code>__mul</code> and <code>__div</code> for
combining scripts in to larger ones.
</div>
<dl class="function">
<dt>
<a name = "script:build"></a>
<strong>script:build()</strong>
</dt>
<dd>
Compile an expression script.
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">expression</span></span>
</ol>
</dd>
</dl>
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